318 exhaust manifolds on a 360

The manifold that I think works best is the casting number 53009376. Now there's a few things you need to know besides the casting number. First the "Hollander number" is 327-1721R. For those of you who are not familiar with Hollander....this is a large book that tell the junk yards what parts interchange with what other parts. Like the Hollander part number on a 84 Dodge 360 truck head might be the same as the Hollander number on a 1990 360 Jeep head. If the Hollander number is the same it should be pretty much an exact swap. There is at least one other manifold out there with the same casting number so there may be more but even though the casting number is the same, if they are different in any way even though they are interchangeable, the Hollander number will be different.
As an example the manifold casting number 53009376 comes with and without a smog port. The manifolds are the exact same casting but one comes with the smog port. Since they are not exactly the same (but are interchangeable) the smog port manifold has a Hollander number 327-01580R. This way the junk yard can get the exact manifold you need just by the Hollander number.
If you try and buy one of these manifolds off the internet and it is advertised by the casting number you may or may not get the one you want. Yes, you can plug the smog port but why bother when you can get the correct one for the same price. Many times on ebay they advertise without a picture and they give the casting number so beware!!
There is a long list of vans and or Jeeps/trucks that use this manifold so they are not too hard to find.
There is also the 6618 manifold (see pics). It can also be used on the a-bodies but as I found the exit port ends up real close to the firewall and could likely introduce a lot of heat into the passenger compartment (but it could be used). There is also the 9377 (see pics), it would bolt up to the driver's side if you have a JEEP motor with the starter on the passenger's side, I know because I found out the hard way!!!:violent1:
This is why, as I posted earlier, when I tried to install this manifold (9377) on my '69 Barracuda the exit flange kept hitting against the starter. Well I now know that this manifold came on the 360 Jeep Grand Cherokee and after seeing the manifold on a Jeep this weekend I saw that the Grand Cherokees have the starter on the passenger side which frees up the driver's starter space for the manifold.
As it turns out I measured my stock 318 manifold and it came out to be 1 5/8 exit hole (see pics)....that's pretty small. If you have a late 60s 318 with stock manifolds yours should be the same. Yes my old original 318 manifold is for sale $50 plus shipping. I'll give you people more info later but here are some more pics of manifolds for you to compare.
PS - I have never found any of these (small block) Jeep or Mag truck manifolds to measure more than 2 1/8", and the hole is only 2 1/8" in one spot and smaller everywhere else. I can machine them to come out very close to 2 1/4" (all the way around) but I have not seen one that came with a factory hole that big, except the 340.
Treblig